Means for forming boiler-headers.



-SHEET l.

LfKAR-NS. I MEANS FOR FORMING BOHLER HEADEBS.

'APPLlcArloN FILED MAY s. |911. I

Patented Nov. 18,1919. 4sHEATs UNITED, sTATEs PATENT oEEIcE.

LINUS L. KAItNS, OF ROCK ISLAND, ILLINOIS, ASSIGNOR TOTHEBABCOCK da WILCOX COMPANY, OF' BAYONNE, NEW JERSEY, A CORPOREION OF NEW JERSEY.

Specification of Letters Patent.

Patented N ov. 18, 1919.

Application led May 5, 1917. Serial No. 166,643.

To all w hom it may concern Be it known that/I,- LINUs L. KA'RNs, a citizen of the United States, residing 'at Rock Island,- in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Means for Forming Boiler-Headers, ofpwhich the fcllowing 1s a specification.

This invention relates to means for forming serpentine headers, for use in 4water tube boilers, and more particularly' to themanner of'l forming the sectional core or .mandrel therefor, the object of the invention being to provide a core possessing the desired amount of iexibility and one which will conform closely to the shape of the 1nner vwalls of the header, and which can be readily removed for reuse.

The invention will be understood by reference to the accompanying' drawings in which Figure 1 is a vertical section through the two dies showing a tube in position, and a sectional core in the tube; F.ig. 2 a similar view on the plane of the line 2-2 of Fig.

4 showing the header as formed from the' tube of Fig. 1, and the position of the parts of the core after the `dles' have acted; Fig. 3 a sectional plan view on the `plane of the line 3 3 of Fig. 2; Fig. 4 'a transverse section on the plane of the line 4-#4 of Fig. 2,

' the core being removed; Fig. 5 a `transverse section' of the header showing one of the core blocks therein; Figs. 6 and 7, are, re-

spectively, side andptopl views of the core block illustrated in Fig. 5; Fig. 8 a vertical section of a portion ofthe header showing several `of the core blocks therein; Figs. 9, 10 and 11 are detail views of one form of core block; Figs.. 12', 13 and 14 detail views of another core block, and Figs. 15,16, 17 and 18 detail views of still another form of core block, all as used' in building up the core to produce the header of Flg. 2; Fig.'

19 is a vertical section and part side view owing the locore of Fig. 19 within a tube, the latter being shownv in section; Fig. 21 is acentra'l horizontal section through Fig. 20 showing the core expanded within vthe tube; Fig. -22 is a plan view of the header of Fig. 19 after it has been formed with stepped tube seats;

Figs. 23, to 26 both inclusive show details of one form of core block; Figs. 27 to 31 details of another form of core block; Figs.

32 to 35 details of another form of core block; Figs. 36 to 40 details o f still another form of core block; and Figs. 41 and 42 details of a fifth form of core block, all as used in the building up of the core for the formation ofthe header of Fig. 19. Similar reference numerals indicate similar parts in the several views.

vReferring to Figs. 1 to 18, the4 numeral 1 designates the stationar of a die, and 2 the movable jaw or member between which the tube 3, to be formed into a header, is placed., The tube is confined laterally vbetween a side plate 4 integral with the stationary member 1, and a movable plate 5. The members 1, 2,4 and 5 are'to be assembled in any suitable press, and the members 2 and 5 are so mounted as to be moved by hydraulic or other suitable well-known means. In practice, the tube t0 be made into a header is first brought to a rectangular form before inserting-the core or dies. l

To insure the accurate formation of the header a core is provided composed of a series of separate blocks 6 and 7, preferably of cast iroh, having their working faces rounded to conform to the die faces. These blocks are arranged in groups of four there being two sets of similar blocks in each group. Each of the blocks 6 and 7 is composed of lfour parts, as shawn in Figs. 9 to 14 `inclusiveand when the partsv are assembled a central opening 13 is provided to accommodate a rod 8. The latter is threaded at each end to receive nuts 8 which bear against pressure blocks 9 between which and jaw` or member' the blocks 6 and 7 when assembled upon the l iirmly in position b the wedge 11 inserted' between one end o the core4 and the` end wall 12. The blocks 6 and 7 are so held as topermit their lateral nioverneiit'duringthe pressing operation. v

11 ZtheQblOcks 6 As shown' 1n 9' to consist of four similar pieces havin beveled meeting surfaces a. and b. The locks 7 shownin Figs. 12 t0 1 4, also consist of four "roo . j entering at right angles thereto.

19 to 21 I have shown an assembled core similar pieces having beveled meeting lsuradapted for use in forming headers 14 which areset vertically in the boiler and in their final form Ihave stepped tube seats 15 so that the tubes 16 enter the'headers at an angle of approximately degrees #to the body thereof, but at right angles to the seats, as shown in Fig. 22.- The core blocks for this form of header are shown' in detail in Figs. 24 to 42 inclusive. They are arranged in groups of four blocks each, two of the blocks being indicated by the numeral 17 Alll of the blocks have their Working faces made and two by the numerals 18 and 18.

to conform to the cross sections of the surfaces of the dies with which they coperate.

I hey are trapezoidal in cross section and in use are caused to slide overA each other on their contiguous inclined sides 21. The

blocks 17 are shown in Figs. 27 to 31 as consisting of four pieces a, a2, a3 and a* having beveled joining surfaces 19l and 20, and inclined sides 21. rIhe blocks 18 are shown in- Figs. 32 to 35 as consisting of four pieces b2. b3 and b4, and the blocks 18 are shown in Figs. 36 to 40 as 'consisting of four pieces c', c2, c3, and 0*, both blocks having beveled joining surfaces 19 and 20 and inclined sides 21 as in the blocks 17 The blocks 18 and 18 differ only in the curvature of their working surfaces. In addition to the blocks 17,

18 and 18 I employ in this form of core,.:y

blocks 22 and .23 at the ends of the core, as indicated in Figs. 19 and 20. A The block 22 is shown in detail in Figs. 23 to 26 as consisting of two pieces d and Z2 having beveled joining surfaces 24. 4The block 23', shown in Figs. 41 and 42, consist of two pieces e and e2 ha ving beveled joining surfaces 25,

The blocks 17, 18, 18', 22 and 23'are as-` sembled in a box or trough about a clamp bar comprising two members 26 and 27 having inclined bearing surfaces by which the bar is capable of contraction and expansion by .a longitudinal movement of one member upon the other effected by means of an eccentric 28 pivoted upon an extension of the member 27 and adapted to bear against the head 26 of member 2.6. At its other end the clamp bar is provided with a key 29 and a bearing block 30. When In Figs.

-cessive headers, inasmuch as the core fills *a number of pieces, all of said pieces havthe core blocks 'are assembled, a central opening 31 is provided throughout the core. The clamp bar is held against lateral movement by the end blocks 22 and 23, the open ing 31, provided by the other blocks 17, 18 and 18 being sufficiently large to perinit the necessary lateral movement of these blocks during the pressing operation. The clamp bar may be provided with stops 32 to limit the relative movement of the members thereof, and any one of a number of openings 33, provided at intervals in the bar, may receive'the key 29 should it be desired to vary the number of blocks employed in the core.

It Will be seen that in all. the forms of blocks above described the lower pieces are provided with .upper inclined .surfaces to engage a. corresponding surface on the upper pieces. Such formation of the blocks aids in the collapse of the core when, after the action of the dies, the core is to be removed from the header, the-upper pieces of the blocks'tending t'o slide off the lower pieces or tending to act as a wedge to force the lower pieces outwardly, according to the lead of the inclines. Also the' described blocks-provide a core which coacts with the dies uniformly in the production of sucthe header and conforms exactly tothe sur# facesof the dies.

Vhat I claim and desire to secure by Letters lPatent of the United Statesaisz- 1. A coie for the purpose describedrr comprisiiig a series of blocks each in elevation i a parallelograin and each consisting of a plurality of pieces whose external surfaces are shaped to form a serpentine boilerheader, said pieces of each block being beveled for contraction of the core to facilitate its removal. 2. A core for the purpose described comprising a series of blocks each consisting of ing beveled faces adapted to contact with complemeiital beveled -faes of two of the remaining pieces in lanes transversely 'of the axis' of the core ormed by said blocks and means for preventingy longitudinal 1l movement of the blocks during the operation vof die-members. ,1 3. A. core .for the purpose described comprising a series of blocks each' divided substantially into quarters along planes intersecting each other internally of the blocks, atie-member, and each of said blocks having an elongated aperture at the line of intersection of the dividing planes. i 4. In means of the character described, the combination with a pair of -relatively movable dies having f complementary projections and depressions for shaping inter- 'vening Work, of a sectional core coacting,

iooI

` of sections opposite each projection .and each i depression fand engaging the work at a multiplicity of points Within each of the pro- Jections and of the depressions to act upon tion by the dies.

5. In means of the character described,

lthe `Work uniformly during a shaping operathe combination With a. *pair of dies7 of a core coacting therewith to for'm corrugations in intervening Work, said core conslsting of a series of rectangular blocks having pairs of parallel sides and faces, and a pair of similar complementary curved Wor'kengaging ends Vadapted to mate with lthe coperatmof face of. a die, and means for 'holding said blocks with their faces in contact While the die members are acting to shape the Work. y

6. In meansof the cl'iaracter'described,

the combinationwitli a pair of dies,- of a core coperating ltherewith toshape intervening material,l said core comprising aA series of blockshaving a pair of parallel v faces, a'pair'of parallel `sides,.and a pair of complemental curved ends, each block consisting of aplurality of pieces having surfaces arranged at an angle to its faces and coperating 'with similar surfaces on contiguous sections tofacilitate contraction of .ing.work, of a core coacting Withsaid dies thev corel in two directions When it is to be rremoved from the work.

7.', In meansA ofthe character described, the' combination with a pair of relatively movable dies havingcomplementary projecf tionsl and depressions for' shaping'intervenand comprising a series of blocksof Which there are a plurality coperating with the complementary projections and depressions and conforming thereto in contour, leach block comprising a plurality of sections having complementary coacting beveled edge faces extending from Aone to the other prising a plurality of bars having coacting inclined surfaces, and a pair 0f stops carriedby said bars at opposite ends ofthe core whereby the vblocks of the coremay be held agalnst separation during\manipulation thereof. 4

9. In means of the character described,

a pair of dies forming transverse crimps in tubes at an acute angle to the length of the tube, in combination with a corecoacting with said dies and comprising a plurality Vof blocks having aI pair of parallel faces inclined .to the longitudinal axis of thecore and each of which consistsof a` `lurality of pieces, and means for holding sald'blocks In testimony whereof I have, hereunto signed my name in the presence of two sub-I s'cribilig Witnesses.-

. LiNUs L. Kanus. Witnesses: A

A. J. MEEHAN, A. H. MURPHY.

with their contiguous faces in contact and against separation from one another. 

